Optically Excited Iodine Bands with Alternate Missing Lines

Details Optically Excited Iodine Bands with Alternate Missing Lines Optically Excited Iodine Bands with Alternate Missing Lines

Feb 1928

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1928natur.121..283w&link_type=abstract

Nature, Volume 121, Issue 3043, pp. 283 (1928).

Physics

Scientific paper

WE have recently been studying, under improved conditions, the fluorescent bands which develop around the `fundamental' doublets when iodine is excited, in the presence of helium, by the green mercury line. The use of a battery of four mercury arc lamps surrounding the iodine tube excites such a brilliant fluorescence that it is possible to photograph it in 24 hours in the second order of a 9-foot grating. On the plates so obtained it is apparent that only alternate lines of the corresponding absorption bands occur, namely, those for which m' is even. Now the fluorescent bands are known to be developed by collisions of the second kind between excited iodine molecules and helium atoms, wherein m' is changed from 34, the value originally excited, to various neighbouring values. The new data, then, show that the rotational quantum number of the excited iodine molecules can change only by even numbers during these collisions of the second kind.

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